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- Homework Statement
- Given an FCC metal with lattice constant a and gap energy Eg in the L point of the Brillouin zone, get the maximum radius of the neck N(111) such that 2nd band remains empty.

- Relevant Equations
- NFE model, etc.

Does anyone have some bibliography about necks in FCC structure Fermi surface? I have to solve this problem and I have no idea how to start. Thanks.